One of the prevailing personality stereotypes we rarely question is that extremely extroverted people do best in sales. On the flip side, extremely introverted people may as well not even try to sell anything because it’s a foregone conclusion that they simply can’t.

A new study published in the journal Psychological Science suggests that not only are these stereotypes wrong, but there’s an entirely different personality type that stands well above the others in sales prowess.

The study was conducted by researcher Adam Grant of The Wharton School of the University of Pennsylvania, also author of the book Give and Take: A Revolutionary Approach to Success.